Commit 427c896f authored by Matthew Wilcox's avatar Matthew Wilcox Committed by Linus Torvalds

arm64: turn flush_dcache_mmap_lock into a no-op

ARM64 doesn't walk the VMA tree in its flush_dcache_page()
implementation, so has no need to take the tree_lock.

Link: http://lkml.kernel.org/r/20180313132639.17387-4-willy@infradead.orgSigned-off-by: default avatarMatthew Wilcox <mawilcox@microsoft.com>
Reviewed-by: default avatarWill Deacon <will.deacon@arm.com>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 60a05271
...@@ -140,10 +140,8 @@ static inline void __flush_icache_all(void) ...@@ -140,10 +140,8 @@ static inline void __flush_icache_all(void)
dsb(ish); dsb(ish);
} }
#define flush_dcache_mmap_lock(mapping) \ #define flush_dcache_mmap_lock(mapping) do { } while (0)
spin_lock_irq(&(mapping)->tree_lock) #define flush_dcache_mmap_unlock(mapping) do { } while (0)
#define flush_dcache_mmap_unlock(mapping) \
spin_unlock_irq(&(mapping)->tree_lock)
/* /*
* We don't appear to need to do anything here. In fact, if we did, we'd * We don't appear to need to do anything here. In fact, if we did, we'd
......
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